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Normal Mixture Quasi Maximum Likelihood Estimation forNon-Stationary TGARCH(1, 1) ModelsHui Wang 1 and Jiazhu Pan 2 * 1 School of Finance, Central University of Finance and Economics, China.2 Department of Mathematics and Statistics, University of Strathclyde, UK .Abstract: Although quasi maximum likelihood estimator based on Gaussian density (G-QMLE) is widely used to estimate GARCH-type models, it does not perform successfully when error distribution is either skewed or leptokurtic. This paper proposes normal mixture quasi-maximum likelihood estimator (NM-QMLE) for non-stationary TGARCH(1, 1) models. We show that, under mild regular conditions, there is no consistent estimator for the intercept, and the proposed estimator for any other parameter is consistent.